Here’s a breakdown of the HTML code you provided,focusing on the image facts and what it represents:
Overall Structure
The code snippets show parts of a webpage displaying images related to McDonald’s promotions (specifically a Big Mac meal deal).It uses a combination of HTML, picture elements for responsive images (serving WebP if supported, otherwise PNG), and JavaScript (onclick="showPhotoSwipe(...)) to enable a photo gallery/lightbox functionality.
Key Elements and Attributes
* <figure>: This element encapsulates each image and its associated metadata. It’s semantically correct for representing media content.
* <a>: The <a> tag creates a link. In this case, it’s used to trigger the showPhotoSwipe function when clicked, opening the image in a lightbox.
* data-href: This attribute holds the URL of the full-resolution image (e.g., https://resource02.ulifestyle.com.hk/ulcms/content/article/image/w1280/2025/12/20251216161407_b5fc005f3284fafe42cb206b96fb83cce427e905.png). This is the image that will be displayed in the lightbox.
* data-photoindex: A numerical index for the image within the gallery.
* data-title: The title of the image, which will likely be displayed in the lightbox caption (e.g., “麥當勞優惠” – McDonald’s Promotion).
* onclick="showPhotoSwipe($(this));return false;": JavaScript code that calls the showPhotoSwipe function when the link is clicked. $(this) passes a reference to the clicked <a> element to the function. return false; prevents the link from navigating to a new page.
* <picture>: This element allows you to provide multiple image sources based on the user’s browser and screen size.
* <source>: Specifies an image source.
* srcset: The URL of the image.
* type: The MIME type of the image (e.g., image/webp, image/png). The browser will choose the first source it supports.
* data-photoindex: Repeats the index for consistency.
* <img>: The fallback image. If the browser doesn’t support any of the <source> types, it will display this image.
* class="img-responsive": A Bootstrap class that makes the image responsive (scales to fit its container).
* alt: Alternative text for the image (important for accessibility). It says “McDonald’s Big Mac meal special buy one get one free! Average price $22.3 with fries and soda/Teach 1 trick to redeem for free”.
* loading="lazy": A browser hint to lazy-load the image (only load it when it’s near the viewport).
* src="aspect-ratio: 600/600; width: 100%; height: auto;": This is a placeholder. It’s likely a CSS trick to maintain the image’s aspect ratio while making it responsive. The actual image source is determined by the <source> elements.
* onerror="this.onerror = null;this.parentNode.children[0].srcset = this.parentNode.children[1].srcset = this.src;": This is a fallback mechanism. If the image fails to load, it attempts to use the next available source (PNG) as a replacement.
* <div> with class photoSwipe-container img-align-centre uf-images-container: This likely contains the gallery and is used by the PhotoSwipe library.
* <i class="arrows"/>: Probably an icon representing navigation arrows for the photoswipe
